Peel the shallots and finely slice them, slice the tomatoes and kale leaves (removed from the stems) and pluck a handful of mint leaves (and slice them if preferred).

Trim off any excess fat from beef.

Heat the oil in a sauce or large pan over a medium heat. Add the beef and cook for 2-4 minutes on each side, until the beef is medium rare or medium (or well done as desired). Set the cooked beef aside for 2 -3 minutes, then thinly slice it.